| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-44949: parisc: fix a possible DMA corruption |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| parisc: fix a possible DMA corruption |
| |
| ARCH_DMA_MINALIGN was defined as 16 - this is too small - it may be |
| possible that two unrelated 16-byte allocations share a cache line. If |
| one of these allocations is written using DMA and the other is written |
| using cached write, the value that was written with DMA may be |
| corrupted. |
| |
| This commit changes ARCH_DMA_MINALIGN to be 128 on PA20 and 32 on PA1.1 - |
| that's the largest possible cache line size. |
| |
| As different parisc microarchitectures have different cache line size, we |
| define arch_slab_minalign(), cache_line_size() and |
| dma_get_cache_alignment() so that the kernel may tune slab cache |
| parameters dynamically, based on the detected cache line size. |
| |
| The Linux kernel CVE team has assigned CVE-2024-44949 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.1.119 with commit 00baca74fb5879e5f9034b6156671301f500f8ee |
| Fixed in 6.6.46 with commit 642a0b7453daff0295310774016fcb56d1f5bc7f |
| Fixed in 6.10.5 with commit 533de2f470baac40d3bf622fe631f15231a03c9f |
| Fixed in 6.11 with commit 7ae04ba36b381bffe2471eff3a93edced843240f |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-44949 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/parisc/Kconfig |
| arch/parisc/include/asm/cache.h |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/00baca74fb5879e5f9034b6156671301f500f8ee |
| https://git.kernel.org/stable/c/642a0b7453daff0295310774016fcb56d1f5bc7f |
| https://git.kernel.org/stable/c/533de2f470baac40d3bf622fe631f15231a03c9f |
| https://git.kernel.org/stable/c/7ae04ba36b381bffe2471eff3a93edced843240f |
